I have a similar condition which coincided with the following :
1. I bought vegetable plants and had to bring them into the house from my porch due to frosts.
2. I dug up a garden in an area that had not been used for decades. There might have been a high salt content in soil from snow plowing.
3. I ordered a truckload of compost and worked with bare hands planting in this soil and compost.
4. I've been doing much more strenuous work than I normally do and don't bathe that often.